He deduced that the colours of the rainbow were pure colours, while white light was a mixture of all of them. The prism did not add any quality to the light, but rather decomposed it. By projecting the colours and putting them back together again, the light was white again.
Herschel observed a relationship between colour and temperature. According to the original article(Royal Society Publishing), red increases by 3 1/8ºF when each colour increases.He discovered with the ultraviolet.
Wetted a piece of paper with silver chloride. He realised that ultraviolet rays are an invisible stain.
Made lenses and prisms, he obtained the spectrum of the sun, is the father of spectrography. He discovered that there were 570 lines in the spectrum of the sun, named Fraunhofer lines.
Gustav Kirchhoff (physicist), Robert Bunsen (chemist) An ideal body is a black body (continuous spectrum). They burned chemicals, passed them through a filter and as a result obtained a spectrum, which they observed is an emission spectrum.
